Year	current US$
1995	17000000
1996	29000000
1997	15000000
1998	31000000
1999	18000000
2000	16000000
2001	13000000
2002	14000000
2003	14000000
2004	16000000
2005	15000000
2006	16000000
2007	11000000
2008	8000000
2009	20000000
2010	7000000
2011	7000000
2012	5000000
2013	7000000
2014	8000000
2015	8000000
2016	5000000
2017	4000000
2018	13000000
2019	11000000
2020	3000000